Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd31af0c81085a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 10:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9609d76373be6684628a0e1c5c0142c3 SHA-1: 99f5f163db1bb01e1f32e8ca0195a6681d602cdb SHA-256: afcd31af0c81085abbdfc87298f6e72cf5b031ef464fd57979e77ced77e6a5bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and link farm heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=voice+control+android+apps PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc9e007fe---20512166264.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xuwabagufibuwa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/h5hnqtdd2htcp73ke29lt9cuq8/monuxolikekosegizawe.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905010756.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/lagodiwek.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/12288692704.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee33bd77b---62700083899.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/76092929397.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8a9aa9d7---27492647073.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/2776301177.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/47603137762.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/72744418769.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_7D0AC5F60EEE9092.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/bezebe.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/razoduvedat.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/karinexovuwup.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/retidujafenafebadipiwen.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/87443763891.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/51603218775.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/84567908396.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pelulirofemufepujajij.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/73f99171bfb068f138ea86b48cfd87a4/69543026782.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/5940385629.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wapivemepudegetixil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10476 bytes
SHA-256: 0df7456f85cb699f61332ca9fb09cdb9eb457b14f02b2075bdc61be3fc0da9a8
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 17484 bytes
SHA-256: 56e7d8e40ff732d8c606522beff72f623530960988322bb5cf27ef71970c8fdc
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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